High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality, and Perspectives

G. Herranz, M. Basletić, M. Bibes, C. Carrétéro, E. Tafra, E. Jacquet, K. Bouzehouane, C. Deranlot, A. Hamzić, J.-M. Broto, A. Barthélémy, and A. Fert
Phys. Rev. Lett. 98, 216803 – Published 21 May 2007

Abstract

We have investigated the dimensionality and origin of the magnetotransport properties of LaAlO3 films epitaxially grown on TiO2-terminated SrTiO3001 substrates. High-mobility conduction is observed at low deposition oxygen pressures (PO2<105mbar) and has a three-dimensional character. However, at higher PO2 the conduction is dramatically suppressed and nonmetallic behavior appears. Experimental data strongly support an interpretation of these properties based on the creation of oxygen vacancies in the SrTiO3 substrates during the growth of the LaAlO3 layer. When grown on SrTiO3 substrates at low PO2, other oxides generate the same high mobility as LaAlO3 films. This opens interesting prospects for all-oxide electronics.

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  • Received 18 January 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.216803

©2007 American Physical Society

Authors & Affiliations

G. Herranz1,*, M. Basletić1,2, M. Bibes3, C. Carrétéro1, E. Tafra2, E. Jacquet1, K. Bouzehouane1, C. Deranlot1, A. Hamzić2, J.-M. Broto4, A. Barthélémy1, and A. Fert1

  • 1Unité Mixte de Physique CNRS/Thales, Route Départementale 128, 91767 Palaiseau, France
  • 2Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32–P.O. Box 331, HR-10002 Zagreb, Croatia
  • 3Institut d’Electronique Fondamentale, CNRS Université Paris-Sud, 91405 Orsay, France
  • 4Laboratoire National des Champs Magnétiques Pulsés, Université Toulouse III, 143 Avenue de Rangueil, 31400 Tolouse, France

  • *Electronic address: gervasi.herranz@thalesgroup.com

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Issue

Vol. 98, Iss. 21 — 25 May 2007

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